Accession Number:

ADA446750

Title:

Effects of Moderate Aerobic Exercise Combined With Caloric Restriction on Circulating Estrogens and IGF-1 in Premenopausal Women

Descriptive Note:

Annual summary rept. 17 Sep 2001-16 Sep 2005

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Personal Author(s):

• Williams, Nancy I.

Report Date:

2005-08-01

Pagination or Media Count:

47.0

Abstract:

This proposal entitled Effects of moderate aerobic exercise combined with caloric restriction on circulating estrogens and IGF-1 in premenopausal women examined the effects of exercise training combined with caloric restriction, resulting in weight loss, on two hormonal biomarkers for breast cancer i.e., circulating estrogens and insulin-like growth factor I IGF-I. In 33 women who completed the study, exercise 4 X per wk at 79 -6 of maximal heart rate combined with an 32 decrease in caloric intake over four menstrual cycles produced significant increases in aerobic capacity 27-5, decreases in body weight loss ranging from 1-9 kg, and loss of body fat ranging from 5 to 12 of initial percent fat. Light conditioning resulted in significant gains in aerobic capacity 30-5, but only produced a trend toward a decrease in body fat percent -1.2, and only a small change in body weight -0.8 kg. Despite the highly significant changes in body composition and body weight in the exercising group, preliminary results indicate no significant changes in serum estradiol or serum estrone. IGF-I did not change significantly either, indicating that chronic exercise and dieting do not result in favorable changes in two hormonal biomarkers for breast cancer.

Descriptors:

• *HORMONES
• *WEIGHT REDUCTION
• *EXERCISE(PHYSIOLOGY)
• *MENSTRUATION
• *AEROBIC PROCESSES
• *ESTROGENS
• *BREAST CANCER
• BLOOD SERUM
• BODY WEIGHT
• GROWTH(PHYSIOLOGY)
• CALORIFIC VALUE

Subject Categories:

• Biochemistry
• Medicine and Medical Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE